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update readme with links

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commit fc712dccf590df35d3d2f325a0af2a8d0d854e69 1 parent dc29171
Stefan Natchev authored December 07, 2012

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  1. 3  README.md
3  README.md
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@@ -21,6 +21,9 @@ MAX232 chip required for converting RS232 voltage to TTL.
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 ![schematic](http://3.bp.blogspot.com/_xBOs6PWgasI/THnpcjC5zHI/AAAAAAAAAMw/xG8d9NQjHys/s1600/schematic+max232.gif)
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+Also, check the [tutorial how to use wire MAX232](http://arduino.cc/en/Tutorial/ArduinoSoftwareRS232).
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+The part about the software serial is out of date.
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+
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 _NOTE_: connect the PHH37 Rx/Tx wires to pins 0, 1 on the Arduino UNO.
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 When uploading a new sketch, you must disconnect these two wires. Otherwise the sketch will not upload.
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